| Acronym | Definition |
|---|
| OIB | Ok, I'm Back (IRC) |
| OIB | Ocean Isle Beach (North Carolina) |
| OIB | Osoyoos Indian Band (Okanagan Nation Alliance; Canada) |
| OIB | Olympic Incline Bench (exercise equipment) |
| OIB | Option Internationale du Baccalauréat (French educational degree program) |
| OIB | Österreichisches Institut für Bautechnik (Austria) |
| OIB | Organic Industrial Base (US Army) |
| OIB | Oceanic Island Basalt |
| OIB | Operator Initiated Bit (built in test) |
| OIB | Office in a Box (Fusion Systems) |
| OIB | Ozellestirme Idaresi Baskanligi |
| OIB | Orbiter Interface Box (US NASA) |
| OIB | Otago Infantry Battalion (New Zealand) |
| OIB | Office for Infrastructure and Logistics in Brussels (EU) |
| OIB | Opportunities In Business (business brokerage in Minneapolis, MN) |
| OIB | Osobni Indentifikacijski Broj (Croatia) |
| OIB | Oil Injector Button |
| OIB | Online Index Books (Cott Systems) |